diff --git a/src/file_tree.c b/src/file_tree.c
index aafccb4..87db650 100644
--- a/src/file_tree.c
+++ b/src/file_tree.c
@@ -318,8 +318,9 @@ int file_tree_delete_entity(FileTree *ft, string path)
 }
 
 int file_tree_write(FileTree *ft, string path,
-    uint64_t off, uint64_t len, SHA256 *prev_hashes,
-    SHA256 *hashes, SHA256 *removed_hashes, int *num_removed)
+    uint64_t off, uint64_t len, uint32_t num_chunks,
+    SHA256 *prev_hashes, SHA256 *hashes,
+    SHA256 *removed_hashes, int *num_removed)
 {
     int num_comps;
     string comps[MAX_COMPS];
@@ -341,6 +342,8 @@ int file_tree_write(FileTree *ft, string path,
     uint64_t first_chunk_index = off / f->chunk_size;
     uint64_t  last_chunk_index = first_chunk_index + (len - 1) / f->chunk_size;
 
+    assert(last_chunk_index - first_chunk_index + 1 == num_chunks);
+
     if (last_chunk_index >= f->num_chunks) {
         uint64_t old_num_chunks = f->num_chunks;
         SHA256 *new_chunks = sys_malloc((last_chunk_index+1) * sizeof(SHA256));
diff --git a/src/file_tree.h b/src/file_tree.h
index 7cdb05b..a81aef4 100644
--- a/src/file_tree.h
+++ b/src/file_tree.h
@@ -55,7 +55,7 @@ bool   file_tree_uses_hash(FileTree *ft, SHA256 hash);
 int    file_tree_list(FileTree *ft, string path, ListItem *items, int max_items);
 int    file_tree_create_entity(FileTree *ft, string path, bool is_dir, uint64_t chunk_size);
 int    file_tree_delete_entity(FileTree *ft, string path);
-int    file_tree_write(FileTree *ft, string path, uint64_t off, uint64_t len, SHA256 *prev_hashes, SHA256 *hashes, SHA256 *removed_hashes, int *num_removed);
+int    file_tree_write(FileTree *ft, string path, uint64_t off, uint64_t len, uint32_t num_chunks, SHA256 *prev_hashes, SHA256 *hashes, SHA256 *removed_hashes, int *num_removed);
 int    file_tree_read(FileTree *ft, string path, uint64_t off, uint64_t len, uint64_t *chunk_size, SHA256 *hashes, int max_hashes);
 string file_tree_strerror(int code);
 
diff --git a/src/message.c b/src/message.c
index f328aa1..87e934d 100644
--- a/src/message.c
+++ b/src/message.c
@@ -1,5 +1,10 @@
 #include <string.h>
+
+#ifdef _WIN32
+#include <ws2tcpip.h>
+#else
 #include <arpa/inet.h> // inet_ntop
+#endif
 
 #include "message.h"
 
diff --git a/src/metadata_server.c b/src/metadata_server.c
index 6998dee..cd34422 100644
--- a/src/metadata_server.c
+++ b/src/metadata_server.c
@@ -628,7 +628,7 @@ process_client_write(MetadataServer *state, int conn_idx, ByteView msg)
     }
 
     int ret = file_tree_write(&state->file_tree, path, offset, length,
-        old_hashes, new_hashes, removed_hashes, &num_removed);
+        num_chunks, old_hashes, new_hashes, removed_hashes, &num_removed);
 
     if (ret < 0) {
 
diff --git a/src/system.h b/src/system.h
index 2e580fd..b532c92 100644
--- a/src/system.h
+++ b/src/system.h
@@ -9,7 +9,6 @@
 #define WIN32_LEAN_AND_MEAN
 
 #include <direct.h> // _mkdir
-#include <bcrypt.h>
 #include <windows.h>
 #include <winsock2.h>
 #include <ws2tcpip.h>